refactor(x/data): update query service and commands

[ryanchristo]

Description

Ref: #714 / #1152

This pull request makes the following changes:

• updates ByIRI and ByHash to AnchorByIRI and AnchorByHash for clarification
• updates AttestorsByIRI and AttestorsByHash to AttestationsByIRI and AttestationsByHash for clarification
• updates ContentEntry to AnchorInfo and moves to query.go for consistent query response type naming
• updates AttestorEntry to AttestationInfo and moves to query.go for consistent query response type naming
• updates conversion queries to not use the Query prefix for clarification (we are not querying state)
• removes conversion queries by the properties of each hash type and add post option for ConvertHashToIRI
• updates all other queries ByHash to include post option providing previously excluded gRPC REST endpoints
• updates comments and tests to reflect the changes listed above and cleans up integration tests

If need be, I can break this up into smaller pull requests but one thing led to another...

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Author Checklist

All items are required. Please add a note to the item if the item is not applicable and
please add links to any relevant follow up issues.

I have...

• included the correct type prefix in the PR title
• added ! to the type prefix if API or client breaking change
• targeted the correct branch (see PR Targeting)
• provided a link to the relevant issue or specification
• followed the guidelines for building modules
• included the necessary unit and integration tests
• added a changelog entry to CHANGELOG.md
• included comments for documenting Go code
• updated the relevant documentation or specification
• reviewed "Files changed" and left comments if necessary
• confirmed all CI checks have passed

Reviewers Checklist

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your handle next to the items reviewed if you only reviewed selected items.

I have...

• confirmed the correct type prefix in the PR title
• confirmed ! in the type prefix if API or client breaking change
• confirmed all author checklist items have been addressed
• reviewed state machine logic
• reviewed API design and naming
• reviewed documentation is accurate
• reviewed tests and test coverage
• manually tested (if applicable)

[codecov]

Codecov Report

Merging #1156 (eaa2fcd) into master (eb742da) will decrease coverage by 0.13%.
The diff coverage is 93.20%.

@@            Coverage Diff             @@
##           master    #1156      +/-   ##
==========================================
- Coverage   69.59%   69.45%   -0.14%     
==========================================
  Files         221      227       +6     
  Lines       23082    23283     +201     
==========================================
+ Hits        16064    16172     +108     
- Misses       5638     5712      +74     
- Partials     1380     1399      +19     

Flag	Coverage Δ
experimental-codecov	69.72% <93.20%> (+0.06%)	⬆️
stable-codecov	64.08% <93.20%> (+0.02%)	⬆️

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[ryanchristo]

Ready for review again. I can walk through the changes and break out into small pull requests if needed.

[technicallyty]

pre-approving. just needs iterator closes & paginations mentioned above 👍🏻